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Show 1900.] FROM SINGAPORE AND MALACCA. 74l XXXI. Genus AOT^EOPSIS, gen. nov. This genus bears a very general resemblance to Actcea, both in the shape of the carapace, and arrangement of the front, orbits and antennas. But it differs in having well-marked ridges on the endostome, and very distinct carinas on the ambulatory legs; furthermore, the fingers are strongly excavate. The anterolateral margins, too, are much straighter, and the carapace relatively more flat. The characters of the genus, as exemplified in the present specimens (2 males and 2 females), are as follows:- Carapace six-sided, broader than long, generally depressed, but a little declivous towards the front and sides; front broad, and a little advanced, its anterior margin sinuous ; basal joint of the antennas barely entering the internal orbital hiatus, reaching the base of the infero-lateral process of the front by the anterior half of its internal margin, but not quite reaching the apex of the internal subocular lobe externally x; flagellum short. Endostome with well-marked ridges ; merus of the exterior maxillipedes truncate, broader than long, the next joint being articulated at its emarginate antero-internal angle. Chelipedes short with excavate fingers; ambulatory legs of moderate length, meri uni-carinate, next three joints bicarinate. Antero-lateral margius very thick, with four blunt and rounded teeth, the depressions between which are continued on to the subhepatic regions at well marked grooves. Abdomen, in the male five-, in the female seven-jointed. 50. ACT.EOPSIS PALLIDA (Borradaile). (Plate XLV. fig. 6.) Carpiliodes pallidus, Borradaile, P.Z. S. 1900, p. 586, pi. xl. fig. 3. Hab. Singapore; from interstices in coral from off the shore at low water, and up to 6 fms. Two males and two females. Carapace nearly flat behind, slightly declivous towards tbe anterior and antero-lateral margins ; under the lens it is seen to be everywhere closely punctate, with a tendency to a spongy appearance ; breadth one and a half times the length. Proto-gastric grooves prolonged posteriorly to meet the brancbio-hepatic; epigastric lobes limited by a transverse groove behind as well as before ; mesogastric lobe projecting very slightly between them, and the grooves which bound it prolonged posteriorly and outwardly so as nearly to meet the protogastric grooves at their junction with the branchio-hepatic ; hepatic and branchial regions lobulated. Front with a distinct median notch, and sinuous; median lobes broad and rounded and rather prominent, lateral lobes small and only faintly prominent. Superior orbital margin rather thickened internally, and externally to this two closed fissures. Antero-lateral teeth four in number, broad, low and very rounded, except the last which is conical aud obtuse. The depressions between them are continued as grooves on to the subhepatic regions which, together with the exterior maxillipedes, the pterygostomian and sternal regions, are everywhere strongly punctate. 1 Note.-This is not very clearly shown in the figure, PI. X L V . fig. 6. |
